import router from './router'
import store from './store'
import {Message} from 'element-ui'
import NProgress from 'nprogress' // progress bar
import 'nprogress/nprogress.css'// progress bar style
import {getToken} from '@/utils/auth' // getToken from cookie

NProgress.configure({showSpinner: false})// NProgress Configuration

// permission judge function
/*
* roles 用户具备的角色
* permissionRoles  该路由允许访问的角色
* */
function hasPermission(roles, permissionRoles)
{
  if (roles.indexOf('admin') >= 0) return true // admin permission passed directly
  if (!permissionRoles) return true  //不限制角色，即所有角色均可访问
  return roles.some(role => permissionRoles.indexOf(role) >= 0)
}

//无需进行权限验证的路由(路由白名单)
const whiteList = ['/login', '/authredirect']// no redirect whitelist

//全局路由守卫
router.beforeEach((to, from, next) =>
{
  NProgress.start() // start progress bar
  if (getToken())
  { // determine if there has token
    /* has token*/
    if (to.path === '/login')//有token，已经登录验证了，可以直接进入首页
    {
      next({path: '/'})
      NProgress.done() // if current page is dashboard will not trigger	afterEach hook, so manually handle it
    }
    else
    {
      if (store.getters.roles.length === 0)
      { // 判断当前用户是否已拉取完user_info信息(在这里用到的用户信息主要是用户的角色信息)
        store.dispatch('GetUserInfo').then(res =>
        { // 拉取user_info
          const roles = res.data.roles // note: roles must be a array! such as: ['editor','develop']
          store.dispatch('GenerateRoutes', {roles}).then(() =>
          { // 根据roles权限生成可访问的路由表
            router.addRoutes(store.getters.addRouters) // 动态添加可访问路由表
            next({...to, replace: true}) // hack方法 确保addRoutes已完成 ,set the replace: true so the navigation will not leave a history record
          })
        }).catch((err) =>
        {
          store.dispatch('FedLogOut').then(() =>
          {
            Message.error(err || 'Verification failed, please login again')
            next({path: '/'})
          })
        })
      }
      else
      {
        // 没有动态改变权限的需求可直接next() 删除下方权限判断 ↓
        if (hasPermission(store.getters.roles, to.meta.roles))
        {
          next()
        }
        else
        {
          next({path: '/401', replace: true, query: {noGoBack: true}})
        }
        // 可删 ↑
      }
    }
  }
  else
  {
    /* has no token*/
    if (whiteList.indexOf(to.path) !== -1)
    { // 在免登录白名单，直接进入
      next()
    }
    else
    {
      //所有没有token，且路由不在白名单的路由访问全部重定向到登录页
      next('/login') // 否则全部重定向到登录页
      NProgress.done() // if current page is login will not trigger afterEach hook, so manually handle it
    }
  }
})

router.afterEach(() =>
{
  NProgress.done() // finish progress bar
})
